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Allowance for Losses on Loans - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision (release) for loan losses	$ 0	$ 1,000,000	$ 250,000	$ 50,000
Charge-offs, net of (recoveries)	936,000	90,000	3,515,000	4,543,000
Loans receivable, gross	$ 13,304,743,000		$ 13,304,743,000			$ 12,853,678,000
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.35%		0.35%			0.42%
Allowance for loan losses	$ 134,022,000	$ 128,666,000	$ 134,022,000	$ 128,666,000	$ 133,086,000	$ 129,257,000	$ 127,576,000	$ 123,073,000
Allowance for credit losses and reserve for unfunded commitments	$ 140,272,000		$ 140,272,000
Allowance for credit losses and reserve for unfunded commitments, percent of gross loans	1.05%		1.05%
Non-accrual loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 41,005,000		$ 41,005,000			55,686,000
Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	12,115,429,000		12,115,429,000			11,597,492,000
Allowance for loan losses	133,691,000		133,691,000			128,740,000
Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	40,438,000		40,438,000			60,680,000
Allowance for loan losses	331,000		331,000			517,000
Unfunded Loan Commitment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	6,250,000		6,250,000			7,250,000
Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 51,117,000		$ 51,117,000			$ 70,093,000
Ratio of non-performing assets to total assets	0.31%		0.31%			0.44%
Non-accrual loans	$ 41,005,000		$ 41,005,000			$ 55,686,000

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A valuation allowance for financing receivables that are expected to be uncollectible.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized.

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Amount of expense related to estimated loss from loan and lease transactions.

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Reduction to the allowance for credit losses related to financing receivables deemed uncollectible, net of recoveries

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Ratio of Non-Performing Assets to Total Assets

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